基于PID控制器的扭矩-进气量map补偿方法

PID-based compensate algorithm for intake airflow map

随着发动机使用时间的增加,元器件老化和参数漂移等因素导致发动机的特性map与发动机系统不匹配,使得发动机的扭矩输出性能下降.针对map与发动机系统不匹配的问题,本文基于map/机理混合描述的汽油发动机模型,在双闭环气路控制系统的基础上,以扭矩-进气量转换map为例,设计了PID控制器对期望的进气流量进行动态补偿,从而使得汽油机的实际输出扭矩满足期望的发动机扭矩需求.最后,利用高保真的四缸进气道喷射汽油机仿真模型(enDYNA)进行了仿真实验,仿真结果验证了基于PID控制器补偿方法的有效性.

Mismatch between the experimental calibrated map and the actual engine system will lead to performance degradation of the output torque,as components aging or engine parameter drift.A PID controller,based on the map/physical engine model and the designed dual closed-loop controller for airpath,is proposed for compensating the intake airflow map to solve the mentioned mismatching problem such that the actual engine torque meets the torque demand.Finally,simulation results are represented to verify the validation of the PID compensation controller under the environment of four-cylinder port fuel injection gasoline engine model（enDYNA）.